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You shouldn't install software this way.

Removing software which was installed like this may be dangerous:

1. unpack the same ruby to /tmp
2. run:

    ./configure --prefix=/tmp/somedir    # by default prefix points to /usr/local
    make
    make install    # this will install ruby in /usr/local instead of where you've installed it
    cd /tmp/somedir
    find . -type f -exec rm -i /usr/local{} \;    # Use without -i if you are shure
    find . -type d -exec rm -ir /usr/local{} \;

I hope this will help you

REFERENCE

http://serverfault.com/questions/82343/how-do-i-cleanly-remove-ruby-1-8-7-from-centos-5